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International Conference on Geoinformatics

作者： Wei Liu Yunyan Du Hairong Zhang Rulin Xiao State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy and Sciences Beijing China School of Environment Science and Spatial Informatics China University of Mining and Technology Xuzhou Jiangsu China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Chinese Academy and Sciences Beijing China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy and Sciences Beijing China

ISBN: (纸本)9781424445622

Spatial information retrieval which is mainly catalog service based on metadata is the foundation of spatial information sharing. Today's information retrieval methods in catalog service are typically limited to keyword searches or matches of sub-strings, which do not meet user's retrieval demand. This paper presents a semantic similarity degree algorithm, in which geo-ontology is compared from concept of the hierarchical structure similarity degree and property similarity degree to adjust the relations of concept. Firstly, overall evaluating the geo-ontology concept hierarchical structure similarity degree and attribute similarity degree; secondly, the semantic similarity degree was calculated as the basis for spatial information retrieval; In the end, the retrieval algorithm was applied in the ldquoOcean Grid Portalrdquo, the retrieval results demonstrate the feasibility and effectiveness of the semantic similarity degree retrieval algorithm.

关键词： information retrieval information systems Informatics keyword search Oceans Portals Pattern matching information resources Research and development Ontologies

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Routing Protocol for Wireless Sensor Networks in Home Automation

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IFAC Proceedings Volumes 2009年第3期42卷 27-33页

作者： Xiao Hui Li Hong Qin Xu Seung Ho Hong Zhi Wang Xiang Fan Piao Engineering Research Center of Metallurgical Automation and Measurement Technology Ministry of Education Wuhan University of Science and Technology Wuhan Hubei 430081 China State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou 310027 China Department of Electronics Information and System Engineering Hanyang University 425-791 Korea Department of Electronic Information Engineering College of Science and Engineering Yanbian University Yanji 133002 China

Home automation systems based on wireless sensor/actuator networks are characterized by diversity of node power sources, limited computational power, and mobility. We propose a routing protocol that fully uses the location of static nodes to limit the search for a route to a small zone based on the analysis of characteristics and requirements. The calculation of two different kinds of zone and the route discovery procedure are described in this paper. According to the environment of home automation, we compared the performance of our routing protocols with the ad-hoc on-demand distance-vector protocol using simulation and gave suggestions for zone selection. Simulation results showed that our routing protocol dramatically reduced the routing overhead and increased the reliability.

关键词： Wireless Sensor/Actuator Networks Home Automation Routing Protocol

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The ATPG Conflict-Driven Scheme for High Transition Fault Coverage and Low Test Cost

The ATPG Conflict-Driven Scheme for High Transition Fault Co...

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IEEE VLSI Test Symposium (VTS)

作者： Zhen Chen Dong Xiang Boxue Yin Department of Computer Science and Technology Tsinghua University School of software Key Laboratory for Information System Security Ministry of Education Tsinghua National Laboratory for Information Science and Technology Tsinghua University

ISBN: (纸本)9781424437696

This paper presents two new conflict-driven techniques for improving transition fault coverage using multiple scan chains. These techniques are based on a novel test application scheme, in order to break the functional dependency of broadside testing. The two new techniques analyze the ATPG conflicts in broadside test generation, and try to control the flip-flops with most influence on the fault coverage. The conflict-driven method selects some flip-flops that work in the enhanced mode and distributes them into different chains. In the multiple scan chain architecture, to avoid too many scan-in pins, some chains are driven by the same scan-in pin to construct a tree-based architecture. Based on the architecture, the new test application scheme allows some flip-flops working in the enhanced mode, while most of others working in the traditional broadside mode. With the efficient conflict-driven selection method, fault coverage is improved greatly, which can also reduce test application time and compress test data volume. Experimental results show that fault coverage based on the proposed method is comparable to the enhanced scan.

关键词： Automatic test pattern generation Costs Circuit faults Flip-flops Circuit testing Fault detection Software testing system testing Educational technology Paper technology

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Fast KD-tree construction method by probing the optimal splitting plane heuristically

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Jisuanji Xuebao/Chinese Journal of Computers 2009年第2期32卷 185-192页

作者： Fan, Wen-Shan Wang, Bin Department of Computer Science and Technology Tsinghua University Beijing 100084 China School of Software Tsinghua University Beijing 100084 China Key Laboratory for Information System Security Beijing 100084 China Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China

In the field of ray-tracing based photo-realistic rendering, kd-tree is used as an important acceleration structure. This paper focuses on the effective construction of kd-tree, and proposes a novel and fast construction method which is based on the binning algorithm. The method is composed of two main steps. Firstly, by analyzing the SAH cost function, the method determines the most-likely sub-span which holds the splitting plane. Secondly, sub-sampling is used on the resulted span to get much better approximation to the optimal splitting plane. Moreover, the paper discusses the exiting schemes on binning termination condition, points out their problems, and proposes a more reasonable termination condition. The experimental results show that the novel approach is effective. Compared with the previous works, it decreases the construction overhead, improves the quality of generated kd-tree, and the construction procedure is more robust as well.

关键词： Ray tracing

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Space charge characteristics of multi-layer oil-paper insulation under different DC voltages

Space charge characteristics of multi-layer oil-paper insula...

引用

第九届电介质材料性能与应用国际会议(The 9th International Conference on Properties and Applications of Dielectric Materials)

作者： Chao TANG G CHEN M FU Ruijin LIAO The State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongq School of Electronics and Computer Science University of Southampton UK AVERA T&D Technology Centre Stafford UK The State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongq

ISBN: (纸本)9781424443666

In this paper, space charge in oil-paper insulation system has been investigated using the pulsed electroacoustic (PEA) technique. A series of measurements were carried out when the insulation system was subjected to different applied voltages. Charge dynamics in the insulation system during the volts-on, volts-off and decay have been analyzed. It has been found that homocharge injection occurred both at the anode and the cathode. Positive charges are observed to accumulate in the layers, which indicate that the oil-paper layer interfaces act as a barrier for positive charges. The decay tests showed that after 30min, about a quarter of space charges remained in the sample, about 90％ charges disappeared after 2 hours. Finally, total charge variation in these tests were analyzed.

关键词： Space Charge Oil-paper DC Voltage Multi-layer

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Network security situational awareness model based on information fusion

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Jisuanji Yanjiu yu Fazhan/Computer Research and Development 2009年第3期46卷 353-362页

作者： Wei, Yong Lian, Yifeng Feng, Dengguo Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei 230027 China State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences Beijing 100190 China

security situational awareness has become a hot topic in the area of network security research in recent years, which attracts the interest of more and more domestic and foreign researchers. The existing security situational awareness methods are analyzed and compared in detail. Considering the characteristics of multi-source information in network security research, a new network security situational awareness model based on information fusion is proposed. This model fuses multi-source information from a mass of logs by introducing the modified D-S evidence theory, gets the values of nodes security situational awareness by situational factors fusion using attacks threat and vulnerability information which network nodes have and successful attacks depend on, computes the value of network security situational awareness by nodes situation fusion using service information of the network nodes, and draws the security-situation-graph of network. Then, it analyzes the time series of the computing results by ARMA model to forecast the future threat in network security. Finally an example of actual network datasets is given to validate the network security situational awareness model and algorithm. The results show that this model and algorithm is more effective and accurate than the existing security situational awareness methods.

关键词： Time series analysis

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Network security situational awareness model based on log audit and performance correction

引用

Jisuanji Xuebao/Chinese Journal of Computers 2009年第4期32卷 763-772页

作者： Wei, Yong Lian, Yi-Feng Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei 230027 China State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences Beijing 100190 China

This paper analyzes and compares the existing situational awareness methods and proposes a network security situational awareness model based on log audit and performance correction algorithm. First, nodes theoretic security threat is got by log audit and the value of nodes security situation is computed by performance correction algorithm. Then the value of network security situation is computed using service information, the future threat is predicted by several prediction models, and the security Situational Graph (SSG) is drawn. Finally an example is given to validate the network security situational awareness model and algorithm by simulation software. The example proves that the model is more effective and accurate to reflect the network security situational and its trends than traditional methods.

关键词： Network security

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Fuzzy analytic hierarchy process-based utilities evaluation and adoption for DRM security policies

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Tongxin Xuebao/Journal on Communications 2009年第1 A期30卷 126-131页

作者： Zhang, Zhi-Yong Ye, Chuan-Qi Fan, Ke-Feng Zhang, Li-Li Niu, Dan-Mei Electronics Information Engineering College Henan University of Science and Technology Luoyang 471003 China Ministry of Education Key Laboratory of Computer Network and Information Security Xidian University Xi'an 710071 China Information Security Center for the State Key Laboratory of Network and Exchange Beijing Post and Telecom University Beijing 100158 China

The utility evaluation of DRM security policies based on fuzzy analytic hierarchy process (FAHP) and their game-theoretic adoptions were proposed from a novel perspective of the different level security and utilities' analyses. Based on the analytic hierarchy structure, the fuzzy estimation consistency matrix was employed to analyze the weights of optional security components and services, and then the gained weight values were further used for the computing of security policies' utilities and the accomplishing the game, finally yielding Nash equilibriums, that is, optimal policies profiles, as well as pre-conditions for participants. The use case for a group of the typical security policies shows that the result of the game includes two different groups of security policies profiles, as well as contents/services provider could effectively deploy a DRM system in term of the number of consumers purchasing digital contents, and average purchase, thus achieving the balance between the digital copyrights protection and real payoffs of participants.

关键词： Game theory

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A Provable Secure ID-Based Explicit Authenticated key Agreement Protocol Without Random Oracles

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Journal of Computer science & technology 2008年第5期23卷 832-842页

作者：田海博 Willy Susilo 明洋王育民 School of Information Science and Technology Sun Yat-Sen University Guangdong Key Laboratory of Information Security Technology Centre for Computer and Information Security Research (CCISR) School of Computer Science and Software Engineering University of Wollongong School of Information Engineering Chang'an University State Key Laboratory on ISN Xidian University

In this paper, we present an identity-based explicit authenticated key agreement protocol that is provably secure without random oracles. The protocol employs a new method to isolate a session key from key confirmation keys so that there is no direct usage of hash functions in the protocol. The protocol is proved secure without random oracles in a variant of Bellare and Rogaway style model, an exception to current proof method in this style model in the ID-based setting. We believe that this key isolation method is novel and can be further studied for constructing more efficient protocols.

关键词： cryptography identity-based key agreement random oracles

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Multi-proxy quantum group signature scheme with threshold shared verification

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Chinese Physics B 2008年第2期17卷 415-418页

作者：杨宇光 College of Computer Science and Technology Beijing University of Technology State Key Laboratory of Information Security Graduate School of Chinese Academy of Sciences

A multi-proxy quantum group signature scheme with threshold shared verification is proposed. An original signer may authorize a proxy group as his proxy agent. Then only the cooperation of all the signers in the proxy group can generate the proxy signature on behalf of the original signer. In the scheme, any t or more of n receivers can verify the message and any t - 1 or fewer receivers cannot verify the validity of the proxy signature.

关键词： quantum signature multi-proxy quantum group signature threshold shared verification

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